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(No Model.)

M. W. KAHLE. Combined Caliper and Scribe. No. 230,420. Patented July27,- I880.

Inventor Jydomg.

N-PETERS, PHOTO-UTNOGRAPNER. WASHINGTON, D. C

UNITED STATES PATENT OFFICE.

MANUEL W. KAHLE, OF DUKE CENTRE, PENNSYLVANIA, ASSIGNOR TO MARTHA JANEKAHLE, OF'SAME PLACE.

COMBINED CALIPERS AND SCRIBER.

SPECIFICATION forming part of Letters Patent No. 230,420, dated July 27,1880.

Application filed May 17, 1880.

To all whpm it may concern:

Be it known that I, MANUEL W. KAHLE, of Duke Centre, in the county ofMcKean and State of Pennsylvania, have invented certain new and usefulImprovements on a Combined Calipers and Scriber; andIdo hereby declarethat the following description of my said invention, taken in connectionwith the accompanying sheet of drawings, forms a full, clear, and exactspecification, which will enable others skilled in the art to which itappertains to make and use the same.

This invention has general reference to a combined calipers andcenter-scriber; and it consists, essentially, in the peculiarcombination of parts and details of construction, as hereinafter firstfully set forth and described, and then pointed out in the claims.

In the drawings already mentioned, which serve to illustrate my saidinvention more fully, Figure l is a front elevation of my said calipers.Fig. 2 is a transverse sectional elevation of the same. Fig. 3 is avertical elevation of a modified form of my said calipers. Fig. 4 is anedge view of the same, and Fig. ,5 is a transverse sectional elevationon an enlarged scale.

Like parts are designated by corresponding letters of reference in allthe figures.

The object of my present invention is the production of a pair ofcalipers or other measuring-instrument having a pair of legs, by meansof which the center line of any flat or angular piece of work or thecenter of any circular piece can be instantly found and scribed.

To this end my improved calipers consist, essentially, of a pair of armsor legs, A A, having on their upper end a segment, C, the face of whichis provided with fine teeth or cogs D. These two legs are pivoted to atube, E, by means of pins or similar device B passing through lugs G onthe lower end of said tube E. On the upper extremity of this tube thereis provided a bevel-pinion, H, engaging with its teeth those of thesegments C. Centrally through the tube E is passed a cylindrical pointedrod, I, serving as a scriber, as'hereinafter to be described. The upperpart of the pinion H is formed into a milled head, J, by means of whichsaid pinion is revolved. In

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the lower end of the tube E is placed a setscrew, K, to retain thescriber I in any desired position.

Instead of pivoting the legsAA in the lugs G, as shown in Figs. 1, 2,and 5, I may pivot the same, as shown in Figs. 3 and 4:, whichmodification, however, does not alter the operation of my device.

The operation of my combined calipers and center-scriber issubstantially as follows: By withdrawing the central rod or scriber,I,which is made a nice sliding fit in the tube E, from said tube, or bydrawing it far enough out so as not to interfere with the taking ofineasures, my device is a perfect pair of calipers for measuringexternal thicknesses, the opening and closing of the legs being doneeither in the ordinary way or bymeans of the pinion H actuatedby thehead J.

If it is desired to find the center line of any flat or angular bodywithin the limits of my calipers, nothing remains to be done but to setthe calipers to the thickness of the piece and to bring the scriber downto mark said piece. In this manner the center lines of any article canbe instantly found and scribed, or the center of any cylindricalpiecedetermined by marking said piece in two directions at right anglesto each other.

The centering by means of my device is accomplished on account of thelegs of the calipers being connected together by the pinion engaging theteeth of the segments, causing said legs to travel an equal distanceeach from the central rod or scriber, whereby, no matter how wide thelegs may be opened, said rod will always remain in a position midwaybetween the extremities of said legs.

In securing the pinion H to the tube E, I prefer to bevel the aperturein said pinion and spread the tube into said beveled part, as shown inFigs. 2 and 5. This method of fastenin g the pinion may, however, bevaried Without departing from my invention as long as said pinion isfixed to the tube with capability 9 5 divider points, or into any othershape suitable for specific work; or they may be formed into the contourusually adapted for inside calipers, and they will then be found veryconvenient for finding the center of holes, 850.

Having thus fully described my invention, I claim as new, and desire tosecure to me by Letters Patent of the United States, the following:

1. A pair of calipers, compasses, or similar instrument having two legspivoted to a central stem carrying on its upper end a bevelpinion, saidlegs being provided with segments above their point of pivoting,engaging- 3. In a pair of calipers. the combination, with the legs A A,pivoted to a tube and connected together by a pinion engaging the upperextremities of said legs, of thescriber I passed through said tube,substantially as and for the object specified.

4. The improved pair of calipers hereinbe- -fore described, consisting,essentially, of the legs A A, having the circular segments 0, providedwith teeth D, the central tube, E, provided with lugs G for attachmentof said legs, the pinion H, fitted to and revolving on the upper end ofsaid tube and engaging said segments, and the scriber I, substantiallyas and for the purpose set forth.

In testimony that 1 claim the foregoing as my invention I have heretoset my hand in the presence of two subscribing witnesses.

MANUEL WV. KAHLE,

Attest:

MICHAEL J. STARK, FRANK Hmsoizt.

